CN104149724B - Crushing force course active control device for thin-walled cylinder energy absorption structure - Google Patents
Crushing force course active control device for thin-walled cylinder energy absorption structure Download PDFInfo
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- CN104149724B CN104149724B CN201410344492.6A CN201410344492A CN104149724B CN 104149724 B CN104149724 B CN 104149724B CN 201410344492 A CN201410344492 A CN 201410344492A CN 104149724 B CN104149724 B CN 104149724B
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Abstract
The invention discloses a crushing force course active control device for a thin-walled cylinder energy absorption structure. In the length L direction of a thin-walled cylinder, annular grooves with depths ranging from h0 to h0-nt are gradually formed inside and outside the cylinder, and the interval of the grooves is W; by setup of the depth h0 and the groove interval W, amplitude and pulse width of a buckling initial crushing force can be controlled, and by setup of the depth variation t of different grooves, variation of a buckling crushing force can be adjusted precisely. By the aid of the annular grooves in different size along the length direction of the thin-walled cylinder, the buckling mode and plastic hinge forming position of the thin-walled cylinder can be effectively controlled; by control of depth variation, widths, intervals and the like of the grooves, a buckling crushing force course can be effectively controlled.
Description
Technical field
The present invention relates to collision energy-absorbing safety protection field is and in particular to a kind of crushing force of thin cylinder endergonic structure is gone through
Journey active control device.
Background technology
For the vehicles such as automobile, bullet train, impingement phenomenon always is of crucial importance and can not avoid
Problem.In recent years, increase sharply with automobile and bullet train quantity and travel speed continuous improvement so that collision problem
More and more prominent, the collision accident increasing sharply can cause great personal injury and property loss, Impact Resisting Capability become automobile,
The problem of overriding concern during the structure designs such as bullet train.
People notice that thin cylinder typically has stable progressive failure model under axial compression very early, are bent by plasticity
Bent energy absorption.Thin cylinder is traditional buffering energy-absorbing structure, is also one of most widely used buffering energy-absorbing structure, even if
As beer fills, lightweight construction is subject to the effect of axial impact loading also can absorb considerable energy.Thin cylinder is ground
Study carefully the metal tube more than other cross sectional shapes, thin cylinder is also widely applied in energy-absorbing system, is on the one hand because
Deformation pattern stable thus controllably energy absorption, be on the other hand because in the vehicles containing substantial amounts of thin cylinder knot
Structure, thus ensure not increasing extra weight in crash-worthiness designs.Thin-wall construction is subject to the dynamic elasto-plaslicity of axial impact loading
Flexing is a very complicated phenomenon, and the joint effect of geometric parameter, load condition and material character according to housing has three kinds
The Failure Model of type, that is, (before big radial displacement, cylinder produces wrinkle along whole length direction to dynamic plastic buckling
Folding), (in the case of low velocity impact, similar to static(al) situation, fold is from the beginning of one end to its deformation process to dynamic progressive buckling
Formed and gradually develop to the other end, this kind of pattern is preferable energy-absorbing modes) and Euler's bending.
For dynamic progressive buckling, forefathers have done substantial amounts of theoretical, experiment and number crunching.Conventional theoretical research
Concentrate in the prediction of the average crushing force of flexing, and collapse energy-absorption process control is lacked theoretical.Thin cylinder is subject to itself
Physical dimension, material behavior, extraneous load, the combined influence of boundary condition, buckling pattern often cannot accurately be estimated, axial symmetry
The plastic hinge forming process of annulus pattern and nonaxisymmetrical diamond pattern, difference is very big in energy absorption ability, this is to pressure
It is far-reaching for the most important parameter of this energy absorption device of course, therefore traditional thin cylinder endergonic structure cannot be real
The accurate prediction of existing Collapse of Concrete and control.
Content of the invention
In consideration of it, it is an object of the invention to provide a kind of crushing force course active control device, above-mentioned existing in order to solve
Technical problem present in technology.
The invention provides a kind of crushing force course active control device of thin cylinder endergonic structure, wherein, along thin
Wall drum length L direction, inside and outside in cylinder progressively arranges different depth h0To h0The annular groove of-nt, between groove
Away from for H;By arranging different depth h0With flute pitch H, control amplitude and the pulsewidth of the initial crushing force of flexing, setting is different
Depth of groove change t, the change of accurate adjustment flexing crushing force.
Further, the derivation formula of n-th section of flexing crushing force Fn is:
Further, described device can apply to automobile, the optimization design of bullet train energy absorption device, and aircraft,
Optimization design of soft spacecraft landing device etc..
The present invention compared with prior art has clear advantage and beneficial effect.Specifically, the present invention is using thin
Various sizes of annular groove along its length, the buckling pattern of effective control thin cylinder, plastic hinge shape are arranged on wall cylinder
Become position.By controlling groove depth change and groove width, separation etc. of groove, can be with effective control flexing crushing force course.Meanwhile,
Give theoretical prediction formula for the thin cylinder impact crushing force course that this kind of method obtains, by adjusting the ginseng of defect
Number, the Collapse of Concrete that can carry out meeting different crushing force courses controls.
Brief description
Fig. 1 is the defect arrangement schematic diagram of thin cylinder crushing force course active control.
Fig. 2 is that groove defect forms the schematic diagram of active control to plastic hinge.
Fig. 3 is the crushing force course curve synoptic diagram of typically complete cylinder.
Fig. 4 is the crushing force course curve synoptic diagram of typical active control cylinder.
Wherein:D:Drum diameter, L:Drum length, h:Wall thickness of cylinder, h0:The depth of first groove, t:Depth of groove
Change, H:Flute pitch, W:Recess width.
Specific embodiment
Crushing force course active control device to the thin cylinder endergonic structure that the present invention provides below in conjunction with the accompanying drawings
Specific embodiment elaborates.
As shown in figure 1, being directed to thin cylinder flexing energy absorption device, along thin cylinder length L direction, in the inside of cylinder
Progressively arrange different depth h with outside0To h0The annular groove of-nt, the spacing of groove is H.Because groove wall thickness is relatively thin, then
For comparing complete cylinder, groove is easier flexing.Because the depth along drum length direction groove is different, then can essence
Really control flexing starting point in upper end groove the deepest, and the progressively little local development of depth of groove downwards.For each
The formation of individual flexing fold, as shown in Fig. 2 by the plastic bending of three plastic hinges and the stretching of material between yield line and pressure
Contract and to absorb impact kinetic energy.By arranging different depth h0With flute pitch H, the amplitude of the initial crushing force of flexing can be controlled
And pulsewidth.Change t by arranging different depths of groove, can be with the change of accurate adjustment flexing crushing force.By said method,
The active control of the crushing force course to thin cylinder Impact Buckling energy absorption device can be accomplished, may apply to automobile, at a high speed
The optimization design of train energy absorption device, aircraft, optimization design of soft spacecraft landing device etc..
The above-mentioned configuration for design, make use of conservation of energy principle, load is to cylinder work done by three plastic hinges
Between the plastic bending of line and plastic hinge, the elongation of material circumference is dissipated, and derives and obtains control theory formula:Wherein S is conquassation position
Move, the interval being in for conquassation displacement, n-th section of flexing crushing force F can be predictedn.
It can be seen in figure 3 that typically the crushing force course curve of complete cylinder is periodically to shake, due to wall thickness, directly
Footpath is constant along its length, and its corresponding crushing force of each fold is consistent substantially, and that is, flexing whole process is consistent substantially
Average crushing force.
Figure 4, it is seen that the crushing force of typical active control cylinder incrementally increases with conquassation displacement, and each pleat
The all available theoretical formula of the average crushing force of wrinkle reaches good prediction, and this is consistent with the control effect of anticipation, by this
Kind of Active Control Method, can accurately predict the behavior in thin cylinder flexing each stage, and can each fold of Accurate Prediction flat
All crushing forces.By changing the arrangement of groove defect, can complete thin cylinder endergonic structure difference crushing force course needs
The design asked.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, made any repair
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (3)
1. the crushing force course active control device of a kind of thin cylinder endergonic structure, wherein, along thin cylinder length L side
To inside and outside in cylinder progressively arranges different depth h0To h0The annular groove of-nt, the spacing of groove is H;By setting
Put different depth h0With flute pitch H, control amplitude and the pulsewidth of the initial crushing force of flexing, different depths of groove are set and become
Change t, the change of accurate adjustment flexing crushing force.
2. device according to claim 1 is it is characterised in that the derivation formula of n-th section of flexing crushing force Fn is:
3. device according to claim 1 and 2 is it is characterised in that described device can apply to automobile, bullet train energy-absorbing
The optimization design of device, and the optimization design of aircraft, soft spacecraft landing device.
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CN105715724A (en) * | 2016-01-26 | 2016-06-29 | 中国科学院力学研究所 | Thin-wall energy absorption cylinder and buckling mode controlling method thereof |
CN111707402A (en) * | 2020-06-28 | 2020-09-25 | 中国人民解放军国防科技大学 | Explosion shock wave energy passive measurement sensor based on negative Poisson ratio structure |
CN115458860B (en) * | 2022-10-24 | 2023-09-15 | 厦门海辰储能科技股份有限公司 | Battery box protection structure, battery box and battery cluster frame |
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CN1417055A (en) * | 2001-11-09 | 2003-05-14 | 中国科学院力学研究所 | Experiment system and method for simulating collision between automobile and parapet |
CN102673501A (en) * | 2012-04-23 | 2012-09-19 | 中国电力科学研究院 | Thin-walled energy-absorbing device |
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JP2009029174A (en) * | 2007-07-24 | 2009-02-12 | Sumitomo Metal Ind Ltd | Method for absorbing impact energy of vehicle body, impact absorbing member and vehicle |
WO2013115066A1 (en) * | 2012-02-01 | 2013-08-08 | 株式会社神戸製鋼所 | Energy absorbing member, method for producing same, and electromagnetic tube expansion method for rectangular cross-section member and polygon cross-section member |
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CN1417055A (en) * | 2001-11-09 | 2003-05-14 | 中国科学院力学研究所 | Experiment system and method for simulating collision between automobile and parapet |
CN102673501A (en) * | 2012-04-23 | 2012-09-19 | 中国电力科学研究院 | Thin-walled energy-absorbing device |
Non-Patent Citations (1)
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